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Finding the Fourth Proportional to 614.04, 921.60 and 578.40

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Solution

The fourth proportional to 614.04, 921.60 and 578.40 is: 868.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.04 : 921.60 = 578.40 : x
  2. Step 2: Convert to fraction form
    614.04/921.60 = 578.40/x
  3. Step 3: Cross multiply
    614.04x = 921.60 × 578.40
  4. Step 4: Simplify right side
    614.04x = 533,053.44
  5. Step 5: Solve for x
    x = 533,053.44/614.04
  6. Step 6: Final answer
    x = 868.11

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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.