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Finding the Fourth Proportional to 152.51, 210.39 and 86.99

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Solution

The fourth proportional to 152.51, 210.39 and 86.99 is: 120.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.51 : 210.39 = 86.99 : x
  2. Step 2: Convert to fraction form
    152.51/210.39 = 86.99/x
  3. Step 3: Cross multiply
    152.51x = 210.39 × 86.99
  4. Step 4: Simplify right side
    152.51x = 18,300.77
  5. Step 5: Solve for x
    x = 18,300.77/152.51
  6. Step 6: Final answer
    x = 120.00

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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.