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Finding the Fourth Proportional to 1,159.79, 1,598.69 and 878.90

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Solution

The fourth proportional to 1,159.79, 1,598.69 and 878.90 is: 1,211.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.79 : 1,598.69 = 878.90 : x
  2. Step 2: Convert to fraction form
    1,159.79/1,598.69 = 878.90/x
  3. Step 3: Cross multiply
    1,159.79x = 1,598.69 × 878.90
  4. Step 4: Simplify right side
    1,159.79x = 1,405,082.45
  5. Step 5: Solve for x
    x = 1,405,082.45/1,159.79
  6. Step 6: Final answer
    x = 1,211.50

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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.