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Finding the Fourth Proportional to 28,612.84, 39,485.52 and 15,866.01

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Solution

The fourth proportional to 28,612.84, 39,485.52 and 15,866.01 is: 21,894.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.84 : 39,485.52 = 15,866.01 : x
  2. Step 2: Convert to fraction form
    28,612.84/39,485.52 = 15,866.01/x
  3. Step 3: Cross multiply
    28,612.84x = 39,485.52 × 15,866.01
  4. Step 4: Simplify right side
    28,612.84x = 626,477,655.18
  5. Step 5: Solve for x
    x = 626,477,655.18/28,612.84
  6. Step 6: Final answer
    x = 21,894.98

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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.