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Finding the Fourth Proportional to 991.55, 1,368.78 and 593.36

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Solution

The fourth proportional to 991.55, 1,368.78 and 593.36 is: 819.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.55 : 1,368.78 = 593.36 : x
  2. Step 2: Convert to fraction form
    991.55/1,368.78 = 593.36/x
  3. Step 3: Cross multiply
    991.55x = 1,368.78 × 593.36
  4. Step 4: Simplify right side
    991.55x = 812,179.30
  5. Step 5: Solve for x
    x = 812,179.30/991.55
  6. Step 6: Final answer
    x = 819.10

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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.