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Finding the Fourth Proportional to 28,155.63, 42,220.99 and 8,430.51

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Solution

The fourth proportional to 28,155.63, 42,220.99 and 8,430.51 is: 12,642.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,155.63 : 42,220.99 = 8,430.51 : x
  2. Step 2: Convert to fraction form
    28,155.63/42,220.99 = 8,430.51/x
  3. Step 3: Cross multiply
    28,155.63x = 42,220.99 × 8,430.51
  4. Step 4: Simplify right side
    28,155.63x = 355,944,362.36
  5. Step 5: Solve for x
    x = 355,944,362.36/28,155.63
  6. Step 6: Final answer
    x = 12,642.03

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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.