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Finding the Fourth Proportional to 56,987.78, 85,429.40 and 21,901.01

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Solution

The fourth proportional to 56,987.78, 85,429.40 and 21,901.01 is: 32,831.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,987.78 : 85,429.40 = 21,901.01 : x
  2. Step 2: Convert to fraction form
    56,987.78/85,429.40 = 21,901.01/x
  3. Step 3: Cross multiply
    56,987.78x = 85,429.40 × 21,901.01
  4. Step 4: Simplify right side
    56,987.78x = 1,870,989,607.04
  5. Step 5: Solve for x
    x = 1,870,989,607.04/56,987.78
  6. Step 6: Final answer
    x = 32,831.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.