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Finding the Fourth Proportional to 864.13, 1,192.51 and 491.19

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Solution

The fourth proportional to 864.13, 1,192.51 and 491.19 is: 677.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.13 : 1,192.51 = 491.19 : x
  2. Step 2: Convert to fraction form
    864.13/1,192.51 = 491.19/x
  3. Step 3: Cross multiply
    864.13x = 1,192.51 × 491.19
  4. Step 4: Simplify right side
    864.13x = 585,746.53
  5. Step 5: Solve for x
    x = 585,746.53/864.13
  6. Step 6: Final answer
    x = 677.85

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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.