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Finding the Fourth Proportional to 875,728.80, 1,312,621.20 and 343,072.80

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Solution

The fourth proportional to 875,728.80, 1,312,621.20 and 343,072.80 is: 514,228.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    875,728.80 : 1,312,621.20 = 343,072.80 : x
  2. Step 2: Convert to fraction form
    875,728.80/1,312,621.20 = 343,072.80/x
  3. Step 3: Cross multiply
    875,728.80x = 1,312,621.20 × 343,072.80
  4. Step 4: Simplify right side
    875,728.80x = 450,324,630,423.36
  5. Step 5: Solve for x
    x = 450,324,630,423.36/875,728.80
  6. Step 6: Final answer
    x = 514,228.41

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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.