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Finding the Fourth Proportional to 644,555.60, 889,629 and 358,174.16

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Solution

The fourth proportional to 644,555.60, 889,629 and 358,174.16 is: 494,359.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,555.60 : 889,629 = 358,174.16 : x
  2. Step 2: Convert to fraction form
    644,555.60/889,629 = 358,174.16/x
  3. Step 3: Cross multiply
    644,555.60x = 889,629 × 358,174.16
  4. Step 4: Simplify right side
    644,555.60x = 318,642,119,786.64
  5. Step 5: Solve for x
    x = 318,642,119,786.64/644,555.60
  6. Step 6: Final answer
    x = 494,359.40

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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.