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Finding the Fourth Proportional to 1,140.70, 1,572.60 and 875.02

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Solution

The fourth proportional to 1,140.70, 1,572.60 and 875.02 is: 1,206.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.70 : 1,572.60 = 875.02 : x
  2. Step 2: Convert to fraction form
    1,140.70/1,572.60 = 875.02/x
  3. Step 3: Cross multiply
    1,140.70x = 1,572.60 × 875.02
  4. Step 4: Simplify right side
    1,140.70x = 1,376,056.45
  5. Step 5: Solve for x
    x = 1,376,056.45/1,140.70
  6. Step 6: Final answer
    x = 1,206.33

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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.