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Finding the Fourth Proportional to 620,869.80, 931,434.30 and 354,412.20

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Solution

The fourth proportional to 620,869.80, 931,434.30 and 354,412.20 is: 531,692.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,869.80 : 931,434.30 = 354,412.20 : x
  2. Step 2: Convert to fraction form
    620,869.80/931,434.30 = 354,412.20/x
  3. Step 3: Cross multiply
    620,869.80x = 931,434.30 × 354,412.20
  4. Step 4: Simplify right side
    620,869.80x = 330,111,679,418.46
  5. Step 5: Solve for x
    x = 330,111,679,418.46/620,869.80
  6. Step 6: Final answer
    x = 531,692.28

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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.