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Finding the Fourth Proportional to 518,961.40, 778,442.10 and 238,478.65

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Solution

The fourth proportional to 518,961.40, 778,442.10 and 238,478.65 is: 357,717.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,961.40 : 778,442.10 = 238,478.65 : x
  2. Step 2: Convert to fraction form
    518,961.40/778,442.10 = 238,478.65/x
  3. Step 3: Cross multiply
    518,961.40x = 778,442.10 × 238,478.65
  4. Step 4: Simplify right side
    518,961.40x = 185,641,821,111.17
  5. Step 5: Solve for x
    x = 185,641,821,111.17/518,961.40
  6. Step 6: Final answer
    x = 357,717.98

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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.