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Finding the Fourth Proportional to 620,879.16, 857,023.02 and 403,385.40

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Solution

The fourth proportional to 620,879.16, 857,023.02 and 403,385.40 is: 556,808.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,879.16 : 857,023.02 = 403,385.40 : x
  2. Step 2: Convert to fraction form
    620,879.16/857,023.02 = 403,385.40/x
  3. Step 3: Cross multiply
    620,879.16x = 857,023.02 × 403,385.40
  4. Step 4: Simplify right side
    620,879.16x = 345,710,573,731.91
  5. Step 5: Solve for x
    x = 345,710,573,731.91/620,879.16
  6. Step 6: Final answer
    x = 556,808.15

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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.