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Finding the Fourth Proportional to 1,455.42, 2,005.35 and 988.86

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Solution

The fourth proportional to 1,455.42, 2,005.35 and 988.86 is: 1,362.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.42 : 2,005.35 = 988.86 : x
  2. Step 2: Convert to fraction form
    1,455.42/2,005.35 = 988.86/x
  3. Step 3: Cross multiply
    1,455.42x = 2,005.35 × 988.86
  4. Step 4: Simplify right side
    1,455.42x = 1,983,010.40
  5. Step 5: Solve for x
    x = 1,983,010.40/1,455.42
  6. Step 6: Final answer
    x = 1,362.50

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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.