Home / 21,327.90-31,988.16-9,638.40

Finding the Fourth Proportional to 21,327.90, 31,988.16 and 9,638.40

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Solution

The fourth proportional to 21,327.90, 31,988.16 and 9,638.40 is: 14,455.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,327.90 : 31,988.16 = 9,638.40 : x
  2. Step 2: Convert to fraction form
    21,327.90/31,988.16 = 9,638.40/x
  3. Step 3: Cross multiply
    21,327.90x = 31,988.16 × 9,638.40
  4. Step 4: Simplify right side
    21,327.90x = 308,314,681.34
  5. Step 5: Solve for x
    x = 308,314,681.34/21,327.90
  6. Step 6: Final answer
    x = 14,455.93

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1.5x scale

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.