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Finding the Fourth Proportional to 642,347.60, 963,137.40 and 393,208.40

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Solution

The fourth proportional to 642,347.60, 963,137.40 and 393,208.40 is: 589,577.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,347.60 : 963,137.40 = 393,208.40 : x
  2. Step 2: Convert to fraction form
    642,347.60/963,137.40 = 393,208.40/x
  3. Step 3: Cross multiply
    642,347.60x = 963,137.40 × 393,208.40
  4. Step 4: Simplify right side
    642,347.60x = 378,713,716,034.16
  5. Step 5: Solve for x
    x = 378,713,716,034.16/642,347.60
  6. Step 6: Final answer
    x = 589,577.54

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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.