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Finding the Fourth Proportional to 647,813.60, 971,720.40 and 561,208.40

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Solution

The fourth proportional to 647,813.60, 971,720.40 and 561,208.40 is: 841,812.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,813.60 : 971,720.40 = 561,208.40 : x
  2. Step 2: Convert to fraction form
    647,813.60/971,720.40 = 561,208.40/x
  3. Step 3: Cross multiply
    647,813.60x = 971,720.40 × 561,208.40
  4. Step 4: Simplify right side
    647,813.60x = 545,337,650,931.36
  5. Step 5: Solve for x
    x = 545,337,650,931.36/647,813.60
  6. Step 6: Final answer
    x = 841,812.60

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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.