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Finding the Fourth Proportional to 750,989.61, 1,126,894.32 and 318,640.32

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Solution

The fourth proportional to 750,989.61, 1,126,894.32 and 318,640.32 is: 478,134.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    750,989.61 : 1,126,894.32 = 318,640.32 : x
  2. Step 2: Convert to fraction form
    750,989.61/1,126,894.32 = 318,640.32/x
  3. Step 3: Cross multiply
    750,989.61x = 1,126,894.32 × 318,640.32
  4. Step 4: Simplify right side
    750,989.61x = 359,073,966,730.98
  5. Step 5: Solve for x
    x = 359,073,966,730.98/750,989.61
  6. Step 6: Final answer
    x = 478,134.40

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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.