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Finding the Fourth Proportional to 39,165.90, 58,743.06 and 12,870.90

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Solution

The fourth proportional to 39,165.90, 58,743.06 and 12,870.90 is: 19,304.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,165.90 : 58,743.06 = 12,870.90 : x
  2. Step 2: Convert to fraction form
    39,165.90/58,743.06 = 12,870.90/x
  3. Step 3: Cross multiply
    39,165.90x = 58,743.06 × 12,870.90
  4. Step 4: Simplify right side
    39,165.90x = 756,076,050.95
  5. Step 5: Solve for x
    x = 756,076,050.95/39,165.90
  6. Step 6: Final answer
    x = 19,304.45

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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.