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Finding the Fourth Proportional to 518,945.40, 778,442.40 and 163,987.20

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Solution

The fourth proportional to 518,945.40, 778,442.40 and 163,987.20 is: 245,988.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,945.40 : 778,442.40 = 163,987.20 : x
  2. Step 2: Convert to fraction form
    518,945.40/778,442.40 = 163,987.20/x
  3. Step 3: Cross multiply
    518,945.40x = 778,442.40 × 163,987.20
  4. Step 4: Simplify right side
    518,945.40x = 127,654,589,537.28
  5. Step 5: Solve for x
    x = 127,654,589,537.28/518,945.40
  6. Step 6: Final answer
    x = 245,988.48

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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.