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Finding the Fourth Proportional to 19,315.79, 28,966.40 and 8,920.25

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Solution

The fourth proportional to 19,315.79, 28,966.40 and 8,920.25 is: 13,377.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,315.79 : 28,966.40 = 8,920.25 : x
  2. Step 2: Convert to fraction form
    19,315.79/28,966.40 = 8,920.25/x
  3. Step 3: Cross multiply
    19,315.79x = 28,966.40 × 8,920.25
  4. Step 4: Simplify right side
    19,315.79x = 258,387,485.00
  5. Step 5: Solve for x
    x = 258,387,485.00/19,315.79
  6. Step 6: Final answer
    x = 13,377.01

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1.5x scale

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.