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Finding the Fourth Proportional to 1,010.07, 1,390.38 and 878.85

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Solution

The fourth proportional to 1,010.07, 1,390.38 and 878.85 is: 1,209.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.07 : 1,390.38 = 878.85 : x
  2. Step 2: Convert to fraction form
    1,010.07/1,390.38 = 878.85/x
  3. Step 3: Cross multiply
    1,010.07x = 1,390.38 × 878.85
  4. Step 4: Simplify right side
    1,010.07x = 1,221,937.11
  5. Step 5: Solve for x
    x = 1,221,937.11/1,010.07
  6. Step 6: Final answer
    x = 1,209.75

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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.