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Finding the Fourth Proportional to 1,117.32, 1,541.67 and 645.21

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Solution

The fourth proportional to 1,117.32, 1,541.67 and 645.21 is: 890.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.32 : 1,541.67 = 645.21 : x
  2. Step 2: Convert to fraction form
    1,117.32/1,541.67 = 645.21/x
  3. Step 3: Cross multiply
    1,117.32x = 1,541.67 × 645.21
  4. Step 4: Simplify right side
    1,117.32x = 994,692.70
  5. Step 5: Solve for x
    x = 994,692.70/1,117.32
  6. Step 6: Final answer
    x = 890.25

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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.