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Finding the Fourth Proportional to 1,405.95, 2,109.98 and 529.31

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Solution

The fourth proportional to 1,405.95, 2,109.98 and 529.31 is: 794.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.95 : 2,109.98 = 529.31 : x
  2. Step 2: Convert to fraction form
    1,405.95/2,109.98 = 529.31/x
  3. Step 3: Cross multiply
    1,405.95x = 2,109.98 × 529.31
  4. Step 4: Simplify right side
    1,405.95x = 1,116,833.51
  5. Step 5: Solve for x
    x = 1,116,833.51/1,405.95
  6. Step 6: Final answer
    x = 794.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.