Home / 138,738.47-191,467.76-78,319.35

Finding the Fourth Proportional to 138,738.47, 191,467.76 and 78,319.35

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Solution

The fourth proportional to 138,738.47, 191,467.76 and 78,319.35 is: 108,085.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,738.47 : 191,467.76 = 78,319.35 : x
  2. Step 2: Convert to fraction form
    138,738.47/191,467.76 = 78,319.35/x
  3. Step 3: Cross multiply
    138,738.47x = 191,467.76 × 78,319.35
  4. Step 4: Simplify right side
    138,738.47x = 14,995,630,509.16
  5. Step 5: Solve for x
    x = 14,995,630,509.16/138,738.47
  6. Step 6: Final answer
    x = 108,085.60

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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.