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Finding the Fourth Proportional to 760.57, 1,047.17 and 719.55

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Solution

The fourth proportional to 760.57, 1,047.17 and 719.55 is: 990.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.57 : 1,047.17 = 719.55 : x
  2. Step 2: Convert to fraction form
    760.57/1,047.17 = 719.55/x
  3. Step 3: Cross multiply
    760.57x = 1,047.17 × 719.55
  4. Step 4: Simplify right side
    760.57x = 753,492.97
  5. Step 5: Solve for x
    x = 753,492.97/760.57
  6. Step 6: Final answer
    x = 990.70

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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.