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Finding the Fourth Proportional to 487,547.80, 731,321.70 and 345,830.20

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Solution

The fourth proportional to 487,547.80, 731,321.70 and 345,830.20 is: 518,745.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,547.80 : 731,321.70 = 345,830.20 : x
  2. Step 2: Convert to fraction form
    487,547.80/731,321.70 = 345,830.20/x
  3. Step 3: Cross multiply
    487,547.80x = 731,321.70 × 345,830.20
  4. Step 4: Simplify right side
    487,547.80x = 252,913,129,775.34
  5. Step 5: Solve for x
    x = 252,913,129,775.34/487,547.80
  6. Step 6: Final answer
    x = 518,745.30

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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.