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Finding the Fourth Proportional to 70,641.40, 105,875.70 and 31,156.60

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Solution

The fourth proportional to 70,641.40, 105,875.70 and 31,156.60 is: 46,696.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,641.40 : 105,875.70 = 31,156.60 : x
  2. Step 2: Convert to fraction form
    70,641.40/105,875.70 = 31,156.60/x
  3. Step 3: Cross multiply
    70,641.40x = 105,875.70 × 31,156.60
  4. Step 4: Simplify right side
    70,641.40x = 3,298,726,834.62
  5. Step 5: Solve for x
    x = 3,298,726,834.62/70,641.40
  6. Step 6: Final answer
    x = 46,696.79

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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.