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Finding the Fourth Proportional to 78,699.81, 108,605.75 and 42,889.80

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Solution

The fourth proportional to 78,699.81, 108,605.75 and 42,889.80 is: 59,187.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.81 : 108,605.75 = 42,889.80 : x
  2. Step 2: Convert to fraction form
    78,699.81/108,605.75 = 42,889.80/x
  3. Step 3: Cross multiply
    78,699.81x = 108,605.75 × 42,889.80
  4. Step 4: Simplify right side
    78,699.81x = 4,658,078,681.90
  5. Step 5: Solve for x
    x = 4,658,078,681.90/78,699.81
  6. Step 6: Final answer
    x = 59,187.93

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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.