Home / 128,707.16-193,115.70-66,421.40

Finding the Fourth Proportional to 128,707.16, 193,115.70 and 66,421.40

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Solution

The fourth proportional to 128,707.16, 193,115.70 and 66,421.40 is: 99,660.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,707.16 : 193,115.70 = 66,421.40 : x
  2. Step 2: Convert to fraction form
    128,707.16/193,115.70 = 66,421.40/x
  3. Step 3: Cross multiply
    128,707.16x = 193,115.70 × 66,421.40
  4. Step 4: Simplify right side
    128,707.16x = 12,827,015,155.98
  5. Step 5: Solve for x
    x = 12,827,015,155.98/128,707.16
  6. Step 6: Final answer
    x = 99,660.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.