Home / 31,001.40-42,788.10-18,423.72

Finding the Fourth Proportional to 31,001.40, 42,788.10 and 18,423.72

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Solution

The fourth proportional to 31,001.40, 42,788.10 and 18,423.72 is: 25,428.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,001.40 : 42,788.10 = 18,423.72 : x
  2. Step 2: Convert to fraction form
    31,001.40/42,788.10 = 18,423.72/x
  3. Step 3: Cross multiply
    31,001.40x = 42,788.10 × 18,423.72
  4. Step 4: Simplify right side
    31,001.40x = 788,315,973.73
  5. Step 5: Solve for x
    x = 788,315,973.73/31,001.40
  6. Step 6: Final answer
    x = 25,428.40

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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.