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Finding the Fourth Proportional to 991.40, 1,486.02 and 503.78

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Solution

The fourth proportional to 991.40, 1,486.02 and 503.78 is: 755.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.40 : 1,486.02 = 503.78 : x
  2. Step 2: Convert to fraction form
    991.40/1,486.02 = 503.78/x
  3. Step 3: Cross multiply
    991.40x = 1,486.02 × 503.78
  4. Step 4: Simplify right side
    991.40x = 748,627.16
  5. Step 5: Solve for x
    x = 748,627.16/991.40
  6. Step 6: Final answer
    x = 755.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.