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Finding the Fourth Proportional to 70,509.78, 97,318.17 and 64,835.55

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Solution

The fourth proportional to 70,509.78, 97,318.17 and 64,835.55 is: 89,486.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,509.78 : 97,318.17 = 64,835.55 : x
  2. Step 2: Convert to fraction form
    70,509.78/97,318.17 = 64,835.55/x
  3. Step 3: Cross multiply
    70,509.78x = 97,318.17 × 64,835.55
  4. Step 4: Simplify right side
    70,509.78x = 6,309,677,076.94
  5. Step 5: Solve for x
    x = 6,309,677,076.94/70,509.78
  6. Step 6: Final answer
    x = 89,486.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.