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Finding the Fourth Proportional to 61,143.10, 91,714.65 and 43,428.40

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Solution

The fourth proportional to 61,143.10, 91,714.65 and 43,428.40 is: 65,142.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,143.10 : 91,714.65 = 43,428.40 : x
  2. Step 2: Convert to fraction form
    61,143.10/91,714.65 = 43,428.40/x
  3. Step 3: Cross multiply
    61,143.10x = 91,714.65 × 43,428.40
  4. Step 4: Simplify right side
    61,143.10x = 3,983,020,506.06
  5. Step 5: Solve for x
    x = 3,983,020,506.06/61,143.10
  6. Step 6: Final answer
    x = 65,142.60

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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.