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Finding the Fourth Proportional to 78,615.58, 108,491.45 and 42,807.56

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Solution

The fourth proportional to 78,615.58, 108,491.45 and 42,807.56 is: 59,075.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,615.58 : 108,491.45 = 42,807.56 : x
  2. Step 2: Convert to fraction form
    78,615.58/108,491.45 = 42,807.56/x
  3. Step 3: Cross multiply
    78,615.58x = 108,491.45 × 42,807.56
  4. Step 4: Simplify right side
    78,615.58x = 4,644,253,739.66
  5. Step 5: Solve for x
    x = 4,644,253,739.66/78,615.58
  6. Step 6: Final answer
    x = 59,075.49

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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.