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Finding the Fourth Proportional to 864.66, 1,193.10 and 486.57

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Solution

The fourth proportional to 864.66, 1,193.10 and 486.57 is: 671.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.66 : 1,193.10 = 486.57 : x
  2. Step 2: Convert to fraction form
    864.66/1,193.10 = 486.57/x
  3. Step 3: Cross multiply
    864.66x = 1,193.10 × 486.57
  4. Step 4: Simplify right side
    864.66x = 580,526.67
  5. Step 5: Solve for x
    x = 580,526.67/864.66
  6. Step 6: Final answer
    x = 671.39

Related Problems

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Half scale
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Double scale
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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.