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Finding the Fourth Proportional to 672,938.21, 928,420.22 and 431,353.98

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Solution

The fourth proportional to 672,938.21, 928,420.22 and 431,353.98 is: 595,118.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,938.21 : 928,420.22 = 431,353.98 : x
  2. Step 2: Convert to fraction form
    672,938.21/928,420.22 = 431,353.98/x
  3. Step 3: Cross multiply
    672,938.21x = 928,420.22 × 431,353.98
  4. Step 4: Simplify right side
    672,938.21x = 400,477,754,852.71
  5. Step 5: Solve for x
    x = 400,477,754,852.71/672,938.21
  6. Step 6: Final answer
    x = 595,118.17

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Double scale
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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.