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Finding the Fourth Proportional to 128,145.95, 176,840.71 and 70,789.22

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Solution

The fourth proportional to 128,145.95, 176,840.71 and 70,789.22 is: 97,688.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,145.95 : 176,840.71 = 70,789.22 : x
  2. Step 2: Convert to fraction form
    128,145.95/176,840.71 = 70,789.22/x
  3. Step 3: Cross multiply
    128,145.95x = 176,840.71 × 70,789.22
  4. Step 4: Simplify right side
    128,145.95x = 12,518,416,367.25
  5. Step 5: Solve for x
    x = 12,518,416,367.25/128,145.95
  6. Step 6: Final answer
    x = 97,688.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.