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Finding the Fourth Proportional to 30,761.80, 46,142.70 and 9,985.30

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Solution

The fourth proportional to 30,761.80, 46,142.70 and 9,985.30 is: 14,977.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,761.80 : 46,142.70 = 9,985.30 : x
  2. Step 2: Convert to fraction form
    30,761.80/46,142.70 = 9,985.30/x
  3. Step 3: Cross multiply
    30,761.80x = 46,142.70 × 9,985.30
  4. Step 4: Simplify right side
    30,761.80x = 460,748,702.31
  5. Step 5: Solve for x
    x = 460,748,702.31/30,761.80
  6. Step 6: Final answer
    x = 14,977.95

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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.