Home / 20,981.79-31,345.02-15,011.28

Finding the Fourth Proportional to 20,981.79, 31,345.02 and 15,011.28

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Solution

The fourth proportional to 20,981.79, 31,345.02 and 15,011.28 is: 22,425.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.79 : 31,345.02 = 15,011.28 : x
  2. Step 2: Convert to fraction form
    20,981.79/31,345.02 = 15,011.28/x
  3. Step 3: Cross multiply
    20,981.79x = 31,345.02 × 15,011.28
  4. Step 4: Simplify right side
    20,981.79x = 470,528,871.83
  5. Step 5: Solve for x
    x = 470,528,871.83/20,981.79
  6. Step 6: Final answer
    x = 22,425.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.