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Finding the Fourth Proportional to 978,421.80, 1,465,664.40 and 557,205.60

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Solution

The fourth proportional to 978,421.80, 1,465,664.40 and 557,205.60 is: 834,687.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,421.80 : 1,465,664.40 = 557,205.60 : x
  2. Step 2: Convert to fraction form
    978,421.80/1,465,664.40 = 557,205.60/x
  3. Step 3: Cross multiply
    978,421.80x = 1,465,664.40 × 557,205.60
  4. Step 4: Simplify right side
    978,421.80x = 816,676,411,400.64
  5. Step 5: Solve for x
    x = 816,676,411,400.64/978,421.80
  6. Step 6: Final answer
    x = 834,687.46

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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.