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Finding the Fourth Proportional to 644,215.80, 889,040.70 and 357,740.76

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Solution

The fourth proportional to 644,215.80, 889,040.70 and 357,740.76 is: 493,694.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,215.80 : 889,040.70 = 357,740.76 : x
  2. Step 2: Convert to fraction form
    644,215.80/889,040.70 = 357,740.76/x
  3. Step 3: Cross multiply
    644,215.80x = 889,040.70 × 357,740.76
  4. Step 4: Simplify right side
    644,215.80x = 318,046,095,688.93
  5. Step 5: Solve for x
    x = 318,046,095,688.93/644,215.80
  6. Step 6: Final answer
    x = 493,694.96

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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.