Home / 31,071.79-42,864.40-21,003.74

Finding the Fourth Proportional to 31,071.79, 42,864.40 and 21,003.74

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Solution

The fourth proportional to 31,071.79, 42,864.40 and 21,003.74 is: 28,975.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,071.79 : 42,864.40 = 21,003.74 : x
  2. Step 2: Convert to fraction form
    31,071.79/42,864.40 = 21,003.74/x
  3. Step 3: Cross multiply
    31,071.79x = 42,864.40 × 21,003.74
  4. Step 4: Simplify right side
    31,071.79x = 900,312,712.86
  5. Step 5: Solve for x
    x = 900,312,712.86/31,071.79
  6. Step 6: Final answer
    x = 28,975.24

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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.