Home / 15,291.90-21,089.70-9,909.45

Finding the Fourth Proportional to 15,291.90, 21,089.70 and 9,909.45

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Solution

The fourth proportional to 15,291.90, 21,089.70 and 9,909.45 is: 13,666.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,291.90 : 21,089.70 = 9,909.45 : x
  2. Step 2: Convert to fraction form
    15,291.90/21,089.70 = 9,909.45/x
  3. Step 3: Cross multiply
    15,291.90x = 21,089.70 × 9,909.45
  4. Step 4: Simplify right side
    15,291.90x = 208,987,327.67
  5. Step 5: Solve for x
    x = 208,987,327.67/15,291.90
  6. Step 6: Final answer
    x = 13,666.54

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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.