Home / 20,570.16-28,386.72-11,138.70

Finding the Fourth Proportional to 20,570.16, 28,386.72 and 11,138.70

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Solution

The fourth proportional to 20,570.16, 28,386.72 and 11,138.70 is: 15,371.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.16 : 28,386.72 = 11,138.70 : x
  2. Step 2: Convert to fraction form
    20,570.16/28,386.72 = 11,138.70/x
  3. Step 3: Cross multiply
    20,570.16x = 28,386.72 × 11,138.70
  4. Step 4: Simplify right side
    20,570.16x = 316,191,158.06
  5. Step 5: Solve for x
    x = 316,191,158.06/20,570.16
  6. Step 6: Final answer
    x = 15,371.35

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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.