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Finding the Fourth Proportional to 710.72, 1,066.08 and 479.78

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Solution

The fourth proportional to 710.72, 1,066.08 and 479.78 is: 719.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.72 : 1,066.08 = 479.78 : x
  2. Step 2: Convert to fraction form
    710.72/1,066.08 = 479.78/x
  3. Step 3: Cross multiply
    710.72x = 1,066.08 × 479.78
  4. Step 4: Simplify right side
    710.72x = 511,483.86
  5. Step 5: Solve for x
    x = 511,483.86/710.72
  6. Step 6: Final answer
    x = 719.67

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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.