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Finding the Fourth Proportional to 128,108.79, 176,783.72 and 71,509.23

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Solution

The fourth proportional to 128,108.79, 176,783.72 and 71,509.23 is: 98,679.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,108.79 : 176,783.72 = 71,509.23 : x
  2. Step 2: Convert to fraction form
    128,108.79/176,783.72 = 71,509.23/x
  3. Step 3: Cross multiply
    128,108.79x = 176,783.72 × 71,509.23
  4. Step 4: Simplify right side
    128,108.79x = 12,641,667,336.19
  5. Step 5: Solve for x
    x = 12,641,667,336.19/128,108.79
  6. Step 6: Final answer
    x = 98,679.16

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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.