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Finding the Fourth Proportional to 660,007.20, 988,261.20 and 520,039.20

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Solution

The fourth proportional to 660,007.20, 988,261.20 and 520,039.20 is: 778,680.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,007.20 : 988,261.20 = 520,039.20 : x
  2. Step 2: Convert to fraction form
    660,007.20/988,261.20 = 520,039.20/x
  3. Step 3: Cross multiply
    660,007.20x = 988,261.20 × 520,039.20
  4. Step 4: Simplify right side
    660,007.20x = 513,934,563,839.04
  5. Step 5: Solve for x
    x = 513,934,563,839.04/660,007.20
  6. Step 6: Final answer
    x = 778,680.24

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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.