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Finding the Fourth Proportional to 478,920.60, 660,989.16 and 288,039.24

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Solution

The fourth proportional to 478,920.60, 660,989.16 and 288,039.24 is: 397,541.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,920.60 : 660,989.16 = 288,039.24 : x
  2. Step 2: Convert to fraction form
    478,920.60/660,989.16 = 288,039.24/x
  3. Step 3: Cross multiply
    478,920.60x = 660,989.16 × 288,039.24
  4. Step 4: Simplify right side
    478,920.60x = 190,390,815,294.64
  5. Step 5: Solve for x
    x = 190,390,815,294.64/478,920.60
  6. Step 6: Final answer
    x = 397,541.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.