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Finding the Fourth Proportional to 85,596.10, 128,430.60 and 54,030.40

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Solution

The fourth proportional to 85,596.10, 128,430.60 and 54,030.40 is: 81,068.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,596.10 : 128,430.60 = 54,030.40 : x
  2. Step 2: Convert to fraction form
    85,596.10/128,430.60 = 54,030.40/x
  3. Step 3: Cross multiply
    85,596.10x = 128,430.60 × 54,030.40
  4. Step 4: Simplify right side
    85,596.10x = 6,939,156,690.24
  5. Step 5: Solve for x
    x = 6,939,156,690.24/85,596.10
  6. Step 6: Final answer
    x = 81,068.61

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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.