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Finding the Fourth Proportional to 85,810.30, 128,715.45 and 71,230.30

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Solution

The fourth proportional to 85,810.30, 128,715.45 and 71,230.30 is: 106,845.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,810.30 : 128,715.45 = 71,230.30 : x
  2. Step 2: Convert to fraction form
    85,810.30/128,715.45 = 71,230.30/x
  3. Step 3: Cross multiply
    85,810.30x = 128,715.45 × 71,230.30
  4. Step 4: Simplify right side
    85,810.30x = 9,168,440,118.14
  5. Step 5: Solve for x
    x = 9,168,440,118.14/85,810.30
  6. Step 6: Final answer
    x = 106,845.45

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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.