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Finding the Fourth Proportional to 128,165.79, 176,865.12 and 70,804.20

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Solution

The fourth proportional to 128,165.79, 176,865.12 and 70,804.20 is: 97,707.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,165.79 : 176,865.12 = 70,804.20 : x
  2. Step 2: Convert to fraction form
    128,165.79/176,865.12 = 70,804.20/x
  3. Step 3: Cross multiply
    128,165.79x = 176,865.12 × 70,804.20
  4. Step 4: Simplify right side
    128,165.79x = 12,522,793,329.50
  5. Step 5: Solve for x
    x = 12,522,793,329.50/128,165.79
  6. Step 6: Final answer
    x = 97,707.77

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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.