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Finding the Fourth Proportional to 880,728.78, 1,215,398.84 and 478,320.78

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Solution

The fourth proportional to 880,728.78, 1,215,398.84 and 478,320.78 is: 660,078.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    880,728.78 : 1,215,398.84 = 478,320.78 : x
  2. Step 2: Convert to fraction form
    880,728.78/1,215,398.84 = 478,320.78/x
  3. Step 3: Cross multiply
    880,728.78x = 1,215,398.84 × 478,320.78
  4. Step 4: Simplify right side
    880,728.78x = 581,350,521,159.90
  5. Step 5: Solve for x
    x = 581,350,521,159.90/880,728.78
  6. Step 6: Final answer
    x = 660,078.94

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1.5x scale

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.