Home / 31,090.84-42,871.48-21,001.76

Finding the Fourth Proportional to 31,090.84, 42,871.48 and 21,001.76

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Solution

The fourth proportional to 31,090.84, 42,871.48 and 21,001.76 is: 28,959.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,090.84 : 42,871.48 = 21,001.76 : x
  2. Step 2: Convert to fraction form
    31,090.84/42,871.48 = 21,001.76/x
  3. Step 3: Cross multiply
    31,090.84x = 42,871.48 × 21,001.76
  4. Step 4: Simplify right side
    31,090.84x = 900,376,668.86
  5. Step 5: Solve for x
    x = 900,376,668.86/31,090.84
  6. Step 6: Final answer
    x = 28,959.55

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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.