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Finding the Fourth Proportional to 492,347.90, 679,441.96 and 311,140.36

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Solution

The fourth proportional to 492,347.90, 679,441.96 and 311,140.36 is: 429,374.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,347.90 : 679,441.96 = 311,140.36 : x
  2. Step 2: Convert to fraction form
    492,347.90/679,441.96 = 311,140.36/x
  3. Step 3: Cross multiply
    492,347.90x = 679,441.96 × 311,140.36
  4. Step 4: Simplify right side
    492,347.90x = 211,401,816,033.51
  5. Step 5: Solve for x
    x = 211,401,816,033.51/492,347.90
  6. Step 6: Final answer
    x = 429,374.87

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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.