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Finding the Fourth Proportional to 859,640.20, 1,289,471.10 and 260,607.40

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Solution

The fourth proportional to 859,640.20, 1,289,471.10 and 260,607.40 is: 390,914.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,640.20 : 1,289,471.10 = 260,607.40 : x
  2. Step 2: Convert to fraction form
    859,640.20/1,289,471.10 = 260,607.40/x
  3. Step 3: Cross multiply
    859,640.20x = 1,289,471.10 × 260,607.40
  4. Step 4: Simplify right side
    859,640.20x = 336,045,710,746.14
  5. Step 5: Solve for x
    x = 336,045,710,746.14/859,640.20
  6. Step 6: Final answer
    x = 390,914.37

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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.