Home / 10,140.51-14,065.49-9,870.78

Finding the Fourth Proportional to 10,140.51, 14,065.49 and 9,870.78

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Solution

The fourth proportional to 10,140.51, 14,065.49 and 9,870.78 is: 13,691.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,140.51 : 14,065.49 = 9,870.78 : x
  2. Step 2: Convert to fraction form
    10,140.51/14,065.49 = 9,870.78/x
  3. Step 3: Cross multiply
    10,140.51x = 14,065.49 × 9,870.78
  4. Step 4: Simplify right side
    10,140.51x = 138,837,287.05
  5. Step 5: Solve for x
    x = 138,837,287.05/10,140.51
  6. Step 6: Final answer
    x = 13,691.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.