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Finding the Fourth Proportional to 38,686.80, 58,030.20 and 12,392.40

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Solution

The fourth proportional to 38,686.80, 58,030.20 and 12,392.40 is: 18,588.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,686.80 : 58,030.20 = 12,392.40 : x
  2. Step 2: Convert to fraction form
    38,686.80/58,030.20 = 12,392.40/x
  3. Step 3: Cross multiply
    38,686.80x = 58,030.20 × 12,392.40
  4. Step 4: Simplify right side
    38,686.80x = 719,133,450.48
  5. Step 5: Solve for x
    x = 719,133,450.48/38,686.80
  6. Step 6: Final answer
    x = 18,588.60

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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.