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Finding the Fourth Proportional to 78,615.93, 108,492.30 and 42,807.45

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Solution

The fourth proportional to 78,615.93, 108,492.30 and 42,807.45 is: 59,075.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,615.93 : 108,492.30 = 42,807.45 : x
  2. Step 2: Convert to fraction form
    78,615.93/108,492.30 = 42,807.45/x
  3. Step 3: Cross multiply
    78,615.93x = 108,492.30 × 42,807.45
  4. Step 4: Simplify right side
    78,615.93x = 4,644,278,707.64
  5. Step 5: Solve for x
    x = 4,644,278,707.64/78,615.93
  6. Step 6: Final answer
    x = 59,075.54

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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.