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Finding the Fourth Proportional to 85,495.74, 128,827.18 and 70,254.78

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Solution

The fourth proportional to 85,495.74, 128,827.18 and 70,254.78 is: 105,861.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,495.74 : 128,827.18 = 70,254.78 : x
  2. Step 2: Convert to fraction form
    85,495.74/128,827.18 = 70,254.78/x
  3. Step 3: Cross multiply
    85,495.74x = 128,827.18 × 70,254.78
  4. Step 4: Simplify right side
    85,495.74x = 9,050,725,188.92
  5. Step 5: Solve for x
    x = 9,050,725,188.92/85,495.74
  6. Step 6: Final answer
    x = 105,861.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.