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Finding the Fourth Proportional to 70,511.40, 105,876.45 and 40,986.90

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Solution

The fourth proportional to 70,511.40, 105,876.45 and 40,986.90 is: 61,543.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,511.40 : 105,876.45 = 40,986.90 : x
  2. Step 2: Convert to fraction form
    70,511.40/105,876.45 = 40,986.90/x
  3. Step 3: Cross multiply
    70,511.40x = 105,876.45 × 40,986.90
  4. Step 4: Simplify right side
    70,511.40x = 4,339,547,468.51
  5. Step 5: Solve for x
    x = 4,339,547,468.51/70,511.40
  6. Step 6: Final answer
    x = 61,543.91

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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.