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Finding the Fourth Proportional to 985.03, 1,359.38 and 565.35

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Solution

The fourth proportional to 985.03, 1,359.38 and 565.35 is: 780.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.03 : 1,359.38 = 565.35 : x
  2. Step 2: Convert to fraction form
    985.03/1,359.38 = 565.35/x
  3. Step 3: Cross multiply
    985.03x = 1,359.38 × 565.35
  4. Step 4: Simplify right side
    985.03x = 768,521.80
  5. Step 5: Solve for x
    x = 768,521.80/985.03
  6. Step 6: Final answer
    x = 780.20

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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.