Home / 20,657.16-31,123.58-18,685.08

Finding the Fourth Proportional to 20,657.16, 31,123.58 and 18,685.08

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Solution

The fourth proportional to 20,657.16, 31,123.58 and 18,685.08 is: 28,152.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657.16 : 31,123.58 = 18,685.08 : x
  2. Step 2: Convert to fraction form
    20,657.16/31,123.58 = 18,685.08/x
  3. Step 3: Cross multiply
    20,657.16x = 31,123.58 × 18,685.08
  4. Step 4: Simplify right side
    20,657.16x = 581,546,628.90
  5. Step 5: Solve for x
    x = 581,546,628.90/20,657.16
  6. Step 6: Final answer
    x = 28,152.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.