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Finding the Fourth Proportional to 647,820.60, 971,730.90 and 561,215.40

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Solution

The fourth proportional to 647,820.60, 971,730.90 and 561,215.40 is: 841,823.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,820.60 : 971,730.90 = 561,215.40 : x
  2. Step 2: Convert to fraction form
    647,820.60/971,730.90 = 561,215.40/x
  3. Step 3: Cross multiply
    647,820.60x = 971,730.90 × 561,215.40
  4. Step 4: Simplify right side
    647,820.60x = 545,350,345,735.86
  5. Step 5: Solve for x
    x = 545,350,345,735.86/647,820.60
  6. Step 6: Final answer
    x = 841,823.10

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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.