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Finding the Fourth Proportional to 70,810.42, 97,717.62 and 38,978.64

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Solution

The fourth proportional to 70,810.42, 97,717.62 and 38,978.64 is: 53,790.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,810.42 : 97,717.62 = 38,978.64 : x
  2. Step 2: Convert to fraction form
    70,810.42/97,717.62 = 38,978.64/x
  3. Step 3: Cross multiply
    70,810.42x = 97,717.62 × 38,978.64
  4. Step 4: Simplify right side
    70,810.42x = 3,808,899,931.64
  5. Step 5: Solve for x
    x = 3,808,899,931.64/70,810.42
  6. Step 6: Final answer
    x = 53,790.11

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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.