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Finding the Fourth Proportional to 749.80, 1,038.18 and 711.40

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Solution

The fourth proportional to 749.80, 1,038.18 and 711.40 is: 985.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.80 : 1,038.18 = 711.40 : x
  2. Step 2: Convert to fraction form
    749.80/1,038.18 = 711.40/x
  3. Step 3: Cross multiply
    749.80x = 1,038.18 × 711.40
  4. Step 4: Simplify right side
    749.80x = 738,561.25
  5. Step 5: Solve for x
    x = 738,561.25/749.80
  6. Step 6: Final answer
    x = 985.01

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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.