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Finding the Fourth Proportional to 1,153.07, 1,590.78 and 710.21

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Solution

The fourth proportional to 1,153.07, 1,590.78 and 710.21 is: 979.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.07 : 1,590.78 = 710.21 : x
  2. Step 2: Convert to fraction form
    1,153.07/1,590.78 = 710.21/x
  3. Step 3: Cross multiply
    1,153.07x = 1,590.78 × 710.21
  4. Step 4: Simplify right side
    1,153.07x = 1,129,779.91
  5. Step 5: Solve for x
    x = 1,129,779.91/1,153.07
  6. Step 6: Final answer
    x = 979.80

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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.