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Finding the Fourth Proportional to 88.07, 121.58 and 56.99

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Solution

The fourth proportional to 88.07, 121.58 and 56.99 is: 78.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.07 : 121.58 = 56.99 : x
  2. Step 2: Convert to fraction form
    88.07/121.58 = 56.99/x
  3. Step 3: Cross multiply
    88.07x = 121.58 × 56.99
  4. Step 4: Simplify right side
    88.07x = 6,927.95
  5. Step 5: Solve for x
    x = 6,927.95/88.07
  6. Step 6: Final answer
    x = 78.66

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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.