Home / 31,069.04-42,860.61-21,000.99

Finding the Fourth Proportional to 31,069.04, 42,860.61 and 21,000.99

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Solution

The fourth proportional to 31,069.04, 42,860.61 and 21,000.99 is: 28,971.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,069.04 : 42,860.61 = 21,000.99 : x
  2. Step 2: Convert to fraction form
    31,069.04/42,860.61 = 21,000.99/x
  3. Step 3: Cross multiply
    31,069.04x = 42,860.61 × 21,000.99
  4. Step 4: Simplify right side
    31,069.04x = 900,115,242.00
  5. Step 5: Solve for x
    x = 900,115,242.00/31,069.04
  6. Step 6: Final answer
    x = 28,971.46

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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.