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Finding the Fourth Proportional to 78,319.90, 108,081.10 and 42,509.60

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Solution

The fourth proportional to 78,319.90, 108,081.10 and 42,509.60 is: 58,663.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,319.90 : 108,081.10 = 42,509.60 : x
  2. Step 2: Convert to fraction form
    78,319.90/108,081.10 = 42,509.60/x
  3. Step 3: Cross multiply
    78,319.90x = 108,081.10 × 42,509.60
  4. Step 4: Simplify right side
    78,319.90x = 4,594,484,328.56
  5. Step 5: Solve for x
    x = 4,594,484,328.56/78,319.90
  6. Step 6: Final answer
    x = 58,663.05

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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.