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Finding the Fourth Proportional to 158,343.72, 218,509.65 and 86,722.20

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Solution

The fourth proportional to 158,343.72, 218,509.65 and 86,722.20 is: 119,674.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,343.72 : 218,509.65 = 86,722.20 : x
  2. Step 2: Convert to fraction form
    158,343.72/218,509.65 = 86,722.20/x
  3. Step 3: Cross multiply
    158,343.72x = 218,509.65 × 86,722.20
  4. Step 4: Simplify right side
    158,343.72x = 18,949,637,569.23
  5. Step 5: Solve for x
    x = 18,949,637,569.23/158,343.72
  6. Step 6: Final answer
    x = 119,674.07

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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.