Home / 31,095.81-42,918.35-21,658.91

Finding the Fourth Proportional to 31,095.81, 42,918.35 and 21,658.91

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Solution

The fourth proportional to 31,095.81, 42,918.35 and 21,658.91 is: 29,893.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,095.81 : 42,918.35 = 21,658.91 : x
  2. Step 2: Convert to fraction form
    31,095.81/42,918.35 = 21,658.91/x
  3. Step 3: Cross multiply
    31,095.81x = 42,918.35 × 21,658.91
  4. Step 4: Simplify right side
    31,095.81x = 929,564,357.11
  5. Step 5: Solve for x
    x = 929,564,357.11/31,095.81
  6. Step 6: Final answer
    x = 29,893.56

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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.