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Finding the Fourth Proportional to 865,805.40, 1,298,708.10 and 393,413.40

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Solution

The fourth proportional to 865,805.40, 1,298,708.10 and 393,413.40 is: 590,120.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,805.40 : 1,298,708.10 = 393,413.40 : x
  2. Step 2: Convert to fraction form
    865,805.40/1,298,708.10 = 393,413.40/x
  3. Step 3: Cross multiply
    865,805.40x = 1,298,708.10 × 393,413.40
  4. Step 4: Simplify right side
    865,805.40x = 510,929,169,228.54
  5. Step 5: Solve for x
    x = 510,929,169,228.54/865,805.40
  6. Step 6: Final answer
    x = 590,120.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.