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Finding the Fourth Proportional to 614.79, 921.18 and 551.28

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Solution

The fourth proportional to 614.79, 921.18 and 551.28 is: 826.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.79 : 921.18 = 551.28 : x
  2. Step 2: Convert to fraction form
    614.79/921.18 = 551.28/x
  3. Step 3: Cross multiply
    614.79x = 921.18 × 551.28
  4. Step 4: Simplify right side
    614.79x = 507,820.75
  5. Step 5: Solve for x
    x = 507,820.75/614.79
  6. Step 6: Final answer
    x = 826.00

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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.