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Finding the Fourth Proportional to 864.47, 1,192.96 and 491.45

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Solution

The fourth proportional to 864.47, 1,192.96 and 491.45 is: 678.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.47 : 1,192.96 = 491.45 : x
  2. Step 2: Convert to fraction form
    864.47/1,192.96 = 491.45/x
  3. Step 3: Cross multiply
    864.47x = 1,192.96 × 491.45
  4. Step 4: Simplify right side
    864.47x = 586,273.00
  5. Step 5: Solve for x
    x = 586,273.00/864.47
  6. Step 6: Final answer
    x = 678.19

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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.