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Finding the Fourth Proportional to 38,643.49, 57,973.49 and 11,988.90

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Solution

The fourth proportional to 38,643.49, 57,973.49 and 11,988.90 is: 17,985.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,643.49 : 57,973.49 = 11,988.90 : x
  2. Step 2: Convert to fraction form
    38,643.49/57,973.49 = 11,988.90/x
  3. Step 3: Cross multiply
    38,643.49x = 57,973.49 × 11,988.90
  4. Step 4: Simplify right side
    38,643.49x = 695,038,374.26
  5. Step 5: Solve for x
    x = 695,038,374.26/38,643.49
  6. Step 6: Final answer
    x = 17,985.91

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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.