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Finding the Fourth Proportional to 128,813.16, 177,765.66 and 72,223.32

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Solution

The fourth proportional to 128,813.16, 177,765.66 and 72,223.32 is: 99,670.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,813.16 : 177,765.66 = 72,223.32 : x
  2. Step 2: Convert to fraction form
    128,813.16/177,765.66 = 72,223.32/x
  3. Step 3: Cross multiply
    128,813.16x = 177,765.66 × 72,223.32
  4. Step 4: Simplify right side
    128,813.16x = 12,838,826,147.19
  5. Step 5: Solve for x
    x = 12,838,826,147.19/128,813.16
  6. Step 6: Final answer
    x = 99,670.14

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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.