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Finding the Fourth Proportional to 401,689.80, 601,368.30 and 390,025.80

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Solution

The fourth proportional to 401,689.80, 601,368.30 and 390,025.80 is: 583,906.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,689.80 : 601,368.30 = 390,025.80 : x
  2. Step 2: Convert to fraction form
    401,689.80/601,368.30 = 390,025.80/x
  3. Step 3: Cross multiply
    401,689.80x = 601,368.30 × 390,025.80
  4. Step 4: Simplify right side
    401,689.80x = 234,549,152,302.14
  5. Step 5: Solve for x
    x = 234,549,152,302.14/401,689.80
  6. Step 6: Final answer
    x = 583,906.17

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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.