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Finding the Fourth Proportional to 85,688.80, 128,533.20 and 39,032.80

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Solution

The fourth proportional to 85,688.80, 128,533.20 and 39,032.80 is: 58,549.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,688.80 : 128,533.20 = 39,032.80 : x
  2. Step 2: Convert to fraction form
    85,688.80/128,533.20 = 39,032.80/x
  3. Step 3: Cross multiply
    85,688.80x = 128,533.20 × 39,032.80
  4. Step 4: Simplify right side
    85,688.80x = 5,017,010,688.96
  5. Step 5: Solve for x
    x = 5,017,010,688.96/85,688.80
  6. Step 6: Final answer
    x = 58,549.20

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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.