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Finding the Fourth Proportional to 85,699.56, 128,501.25 and 58,712.40

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Solution

The fourth proportional to 85,699.56, 128,501.25 and 58,712.40 is: 88,035.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,699.56 : 128,501.25 = 58,712.40 : x
  2. Step 2: Convert to fraction form
    85,699.56/128,501.25 = 58,712.40/x
  3. Step 3: Cross multiply
    85,699.56x = 128,501.25 × 58,712.40
  4. Step 4: Simplify right side
    85,699.56x = 7,544,616,790.50
  5. Step 5: Solve for x
    x = 7,544,616,790.50/85,699.56
  6. Step 6: Final answer
    x = 88,035.65

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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.