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Finding the Fourth Proportional to 740.52, 1,021.56 and 491.88

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Solution

The fourth proportional to 740.52, 1,021.56 and 491.88 is: 678.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.52 : 1,021.56 = 491.88 : x
  2. Step 2: Convert to fraction form
    740.52/1,021.56 = 491.88/x
  3. Step 3: Cross multiply
    740.52x = 1,021.56 × 491.88
  4. Step 4: Simplify right side
    740.52x = 502,484.93
  5. Step 5: Solve for x
    x = 502,484.93/740.52
  6. Step 6: Final answer
    x = 678.56

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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.