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Finding the Fourth Proportional to 1,140.19, 1,573.32 and 642.83

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Solution

The fourth proportional to 1,140.19, 1,573.32 and 642.83 is: 887.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.19 : 1,573.32 = 642.83 : x
  2. Step 2: Convert to fraction form
    1,140.19/1,573.32 = 642.83/x
  3. Step 3: Cross multiply
    1,140.19x = 1,573.32 × 642.83
  4. Step 4: Simplify right side
    1,140.19x = 1,011,377.30
  5. Step 5: Solve for x
    x = 1,011,377.30/1,140.19
  6. Step 6: Final answer
    x = 887.03

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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.