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Finding the Fourth Proportional to 487,459.90, 731,621.85 and 287,530.30

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Solution

The fourth proportional to 487,459.90, 731,621.85 and 287,530.30 is: 431,550.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,459.90 : 731,621.85 = 287,530.30 : x
  2. Step 2: Convert to fraction form
    487,459.90/731,621.85 = 287,530.30/x
  3. Step 3: Cross multiply
    487,459.90x = 731,621.85 × 287,530.30
  4. Step 4: Simplify right side
    487,459.90x = 210,363,450,017.06
  5. Step 5: Solve for x
    x = 210,363,450,017.06/487,459.90
  6. Step 6: Final answer
    x = 431,550.27

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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.