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Finding the Fourth Proportional to 255,459.12, 383,235.15 and 86,970.81

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Solution

The fourth proportional to 255,459.12, 383,235.15 and 86,970.81 is: 130,472.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,459.12 : 383,235.15 = 86,970.81 : x
  2. Step 2: Convert to fraction form
    255,459.12/383,235.15 = 86,970.81/x
  3. Step 3: Cross multiply
    255,459.12x = 383,235.15 × 86,970.81
  4. Step 4: Simplify right side
    255,459.12x = 33,330,271,415.97
  5. Step 5: Solve for x
    x = 33,330,271,415.97/255,459.12
  6. Step 6: Final answer
    x = 130,472.04

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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.