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Finding the Fourth Proportional to 908.79, 1,254.20 and 515.84

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Solution

The fourth proportional to 908.79, 1,254.20 and 515.84 is: 711.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.79 : 1,254.20 = 515.84 : x
  2. Step 2: Convert to fraction form
    908.79/1,254.20 = 515.84/x
  3. Step 3: Cross multiply
    908.79x = 1,254.20 × 515.84
  4. Step 4: Simplify right side
    908.79x = 646,962.38
  5. Step 5: Solve for x
    x = 646,962.38/908.79
  6. Step 6: Final answer
    x = 711.89

Related Problems

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Half scale
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Double scale
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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.