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Finding the Fourth Proportional to 1,139.42, 1,572.40 and 642.22

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Solution

The fourth proportional to 1,139.42, 1,572.40 and 642.22 is: 886.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.42 : 1,572.40 = 642.22 : x
  2. Step 2: Convert to fraction form
    1,139.42/1,572.40 = 642.22/x
  3. Step 3: Cross multiply
    1,139.42x = 1,572.40 × 642.22
  4. Step 4: Simplify right side
    1,139.42x = 1,009,821.19
  5. Step 5: Solve for x
    x = 1,009,821.19/1,139.42
  6. Step 6: Final answer
    x = 886.26

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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.