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Finding the Fourth Proportional to 808,640.60, 1,212,960.90 and 717,661.40

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Solution

The fourth proportional to 808,640.60, 1,212,960.90 and 717,661.40 is: 1,076,492.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    808,640.60 : 1,212,960.90 = 717,661.40 : x
  2. Step 2: Convert to fraction form
    808,640.60/1,212,960.90 = 717,661.40/x
  3. Step 3: Cross multiply
    808,640.60x = 1,212,960.90 × 717,661.40
  4. Step 4: Simplify right side
    808,640.60x = 870,495,217,639.26
  5. Step 5: Solve for x
    x = 870,495,217,639.26/808,640.60
  6. Step 6: Final answer
    x = 1,076,492.10

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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.