Home / 30,870.50-42,600.40-18,123.47

Finding the Fourth Proportional to 30,870.50, 42,600.40 and 18,123.47

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Solution

The fourth proportional to 30,870.50, 42,600.40 and 18,123.47 is: 25,009.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,870.50 : 42,600.40 = 18,123.47 : x
  2. Step 2: Convert to fraction form
    30,870.50/42,600.40 = 18,123.47/x
  3. Step 3: Cross multiply
    30,870.50x = 42,600.40 × 18,123.47
  4. Step 4: Simplify right side
    30,870.50x = 772,067,071.39
  5. Step 5: Solve for x
    x = 772,067,071.39/30,870.50
  6. Step 6: Final answer
    x = 25,009.87

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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.