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Finding the Fourth Proportional to 85,547.40, 128,078.10 and 80,892.60

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Solution

The fourth proportional to 85,547.40, 128,078.10 and 80,892.60 is: 121,109.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,547.40 : 128,078.10 = 80,892.60 : x
  2. Step 2: Convert to fraction form
    85,547.40/128,078.10 = 80,892.60/x
  3. Step 3: Cross multiply
    85,547.40x = 128,078.10 × 80,892.60
  4. Step 4: Simplify right side
    85,547.40x = 10,360,570,512.06
  5. Step 5: Solve for x
    x = 10,360,570,512.06/85,547.40
  6. Step 6: Final answer
    x = 121,109.12

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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.