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Finding the Fourth Proportional to 487,356.80, 731,035.20 and 345,639.20

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Solution

The fourth proportional to 487,356.80, 731,035.20 and 345,639.20 is: 518,458.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,356.80 : 731,035.20 = 345,639.20 : x
  2. Step 2: Convert to fraction form
    487,356.80/731,035.20 = 345,639.20/x
  3. Step 3: Cross multiply
    487,356.80x = 731,035.20 × 345,639.20
  4. Step 4: Simplify right side
    487,356.80x = 252,674,421,699.84
  5. Step 5: Solve for x
    x = 252,674,421,699.84/487,356.80
  6. Step 6: Final answer
    x = 518,458.80

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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.