Home / 85,731.30-128,617.20-35,783.64

Finding the Fourth Proportional to 85,731.30, 128,617.20 and 35,783.64

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Solution

The fourth proportional to 85,731.30, 128,617.20 and 35,783.64 is: 53,683.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,731.30 : 128,617.20 = 35,783.64 : x
  2. Step 2: Convert to fraction form
    85,731.30/128,617.20 = 35,783.64/x
  3. Step 3: Cross multiply
    85,731.30x = 128,617.20 × 35,783.64
  4. Step 4: Simplify right side
    85,731.30x = 4,602,391,582.61
  5. Step 5: Solve for x
    x = 4,602,391,582.61/85,731.30
  6. Step 6: Final answer
    x = 53,683.91

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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.