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Finding the Fourth Proportional to 91,720.35, 128,583.45 and 91,720.35

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Solution

The fourth proportional to 91,720.35, 128,583.45 and 91,720.35 is: 128,583.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,720.35 : 128,583.45 = 91,720.35 : x
  2. Step 2: Convert to fraction form
    91,720.35/128,583.45 = 91,720.35/x
  3. Step 3: Cross multiply
    91,720.35x = 128,583.45 × 91,720.35
  4. Step 4: Simplify right side
    91,720.35x = 11,793,719,038.21
  5. Step 5: Solve for x
    x = 11,793,719,038.21/91,720.35
  6. Step 6: Final answer
    x = 128,583.45

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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.