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Finding the Fourth Proportional to 78,701.42, 108,604.80 and 42,890.67

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Solution

The fourth proportional to 78,701.42, 108,604.80 and 42,890.67 is: 59,187.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.42 : 108,604.80 = 42,890.67 : x
  2. Step 2: Convert to fraction form
    78,701.42/108,604.80 = 42,890.67/x
  3. Step 3: Cross multiply
    78,701.42x = 108,604.80 × 42,890.67
  4. Step 4: Simplify right side
    78,701.42x = 4,658,132,637.22
  5. Step 5: Solve for x
    x = 4,658,132,637.22/78,701.42
  6. Step 6: Final answer
    x = 59,187.40

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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.