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Finding the Fourth Proportional to 864.32, 1,192.84 and 491.40

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Solution

The fourth proportional to 864.32, 1,192.84 and 491.40 is: 678.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.32 : 1,192.84 = 491.40 : x
  2. Step 2: Convert to fraction form
    864.32/1,192.84 = 491.40/x
  3. Step 3: Cross multiply
    864.32x = 1,192.84 × 491.40
  4. Step 4: Simplify right side
    864.32x = 586,161.58
  5. Step 5: Solve for x
    x = 586,161.58/864.32
  6. Step 6: Final answer
    x = 678.18

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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.