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Finding the Fourth Proportional to 91,707.10, 128,127.50 and 91,707.10

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Solution

The fourth proportional to 91,707.10, 128,127.50 and 91,707.10 is: 128,127.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,707.10 : 128,127.50 = 91,707.10 : x
  2. Step 2: Convert to fraction form
    91,707.10/128,127.50 = 91,707.10/x
  3. Step 3: Cross multiply
    91,707.10x = 128,127.50 × 91,707.10
  4. Step 4: Simplify right side
    91,707.10x = 11,750,201,455.25
  5. Step 5: Solve for x
    x = 11,750,201,455.25/91,707.10
  6. Step 6: Final answer
    x = 128,127.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.