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Finding the Fourth Proportional to 438,415.20, 657,622.80 and 432,510.30

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Solution

The fourth proportional to 438,415.20, 657,622.80 and 432,510.30 is: 648,765.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,415.20 : 657,622.80 = 432,510.30 : x
  2. Step 2: Convert to fraction form
    438,415.20/657,622.80 = 432,510.30/x
  3. Step 3: Cross multiply
    438,415.20x = 657,622.80 × 432,510.30
  4. Step 4: Simplify right side
    438,415.20x = 284,428,634,514.84
  5. Step 5: Solve for x
    x = 284,428,634,514.84/438,415.20
  6. Step 6: Final answer
    x = 648,765.45

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Double scale
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Similar ratio
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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.