Home / 31,090.48-42,939.80-21,001.40

Finding the Fourth Proportional to 31,090.48, 42,939.80 and 21,001.40

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Solution

The fourth proportional to 31,090.48, 42,939.80 and 21,001.40 is: 29,005.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,090.48 : 42,939.80 = 21,001.40 : x
  2. Step 2: Convert to fraction form
    31,090.48/42,939.80 = 21,001.40/x
  3. Step 3: Cross multiply
    31,090.48x = 42,939.80 × 21,001.40
  4. Step 4: Simplify right side
    31,090.48x = 901,795,915.72
  5. Step 5: Solve for x
    x = 901,795,915.72/31,090.48
  6. Step 6: Final answer
    x = 29,005.53

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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.