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Finding the Fourth Proportional to 664.76, 915.60 and 487.27

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Solution

The fourth proportional to 664.76, 915.60 and 487.27 is: 671.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.76 : 915.60 = 487.27 : x
  2. Step 2: Convert to fraction form
    664.76/915.60 = 487.27/x
  3. Step 3: Cross multiply
    664.76x = 915.60 × 487.27
  4. Step 4: Simplify right side
    664.76x = 446,142.23
  5. Step 5: Solve for x
    x = 446,142.23/664.76
  6. Step 6: Final answer
    x = 671.14

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Find fourth proportional to 332.38, 457.80 and 243.63
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.