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Finding the Fourth Proportional to 1,108.99, 1,530.90 and 711.08

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Solution

The fourth proportional to 1,108.99, 1,530.90 and 711.08 is: 981.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.99 : 1,530.90 = 711.08 : x
  2. Step 2: Convert to fraction form
    1,108.99/1,530.90 = 711.08/x
  3. Step 3: Cross multiply
    1,108.99x = 1,530.90 × 711.08
  4. Step 4: Simplify right side
    1,108.99x = 1,088,590.46
  5. Step 5: Solve for x
    x = 1,088,590.46/1,108.99
  6. Step 6: Final answer
    x = 981.60

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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.