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Finding the Fourth Proportional to 85,538.55, 128,264.01 and 45,580.30

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Solution

The fourth proportional to 85,538.55, 128,264.01 and 45,580.30 is: 68,347.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,538.55 : 128,264.01 = 45,580.30 : x
  2. Step 2: Convert to fraction form
    85,538.55/128,264.01 = 45,580.30/x
  3. Step 3: Cross multiply
    85,538.55x = 128,264.01 × 45,580.30
  4. Step 4: Simplify right side
    85,538.55x = 5,846,312,055.00
  5. Step 5: Solve for x
    x = 5,846,312,055.00/85,538.55
  6. Step 6: Final answer
    x = 68,347.10

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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.