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Finding the Fourth Proportional to 85,615.76, 128,477.10 and 61,602.50

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Solution

The fourth proportional to 85,615.76, 128,477.10 and 61,602.50 is: 92,442.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,615.76 : 128,477.10 = 61,602.50 : x
  2. Step 2: Convert to fraction form
    85,615.76/128,477.10 = 61,602.50/x
  3. Step 3: Cross multiply
    85,615.76x = 128,477.10 × 61,602.50
  4. Step 4: Simplify right side
    85,615.76x = 7,914,510,552.75
  5. Step 5: Solve for x
    x = 7,914,510,552.75/85,615.76
  6. Step 6: Final answer
    x = 92,442.22

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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.