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Finding the Fourth Proportional to 128,223.72, 176,947.74 and 70,866.90

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Solution

The fourth proportional to 128,223.72, 176,947.74 and 70,866.90 is: 97,795.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,223.72 : 176,947.74 = 70,866.90 : x
  2. Step 2: Convert to fraction form
    128,223.72/176,947.74 = 70,866.90/x
  3. Step 3: Cross multiply
    128,223.72x = 176,947.74 × 70,866.90
  4. Step 4: Simplify right side
    128,223.72x = 12,539,737,795.81
  5. Step 5: Solve for x
    x = 12,539,737,795.81/128,223.72
  6. Step 6: Final answer
    x = 97,795.77

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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.