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Finding the Fourth Proportional to 18,702.90, 28,055.70 and 11,291.40

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Solution

The fourth proportional to 18,702.90, 28,055.70 and 11,291.40 is: 16,937.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702.90 : 28,055.70 = 11,291.40 : x
  2. Step 2: Convert to fraction form
    18,702.90/28,055.70 = 11,291.40/x
  3. Step 3: Cross multiply
    18,702.90x = 28,055.70 × 11,291.40
  4. Step 4: Simplify right side
    18,702.90x = 316,788,130.98
  5. Step 5: Solve for x
    x = 316,788,130.98/18,702.90
  6. Step 6: Final answer
    x = 16,937.92

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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.