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Finding the Fourth Proportional to 953.61, 1,316.15 and 718.74

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Solution

The fourth proportional to 953.61, 1,316.15 and 718.74 is: 991.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.61 : 1,316.15 = 718.74 : x
  2. Step 2: Convert to fraction form
    953.61/1,316.15 = 718.74/x
  3. Step 3: Cross multiply
    953.61x = 1,316.15 × 718.74
  4. Step 4: Simplify right side
    953.61x = 945,966.06
  5. Step 5: Solve for x
    x = 945,966.06/953.61
  6. Step 6: Final answer
    x = 991.98

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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.