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Finding the Fourth Proportional to 708,638.35, 977,878.78 and 402,672.26

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Solution

The fourth proportional to 708,638.35, 977,878.78 and 402,672.26 is: 555,663.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,638.35 : 977,878.78 = 402,672.26 : x
  2. Step 2: Convert to fraction form
    708,638.35/977,878.78 = 402,672.26/x
  3. Step 3: Cross multiply
    708,638.35x = 977,878.78 × 402,672.26
  4. Step 4: Simplify right side
    708,638.35x = 393,764,658,348.64
  5. Step 5: Solve for x
    x = 393,764,658,348.64/708,638.35
  6. Step 6: Final answer
    x = 555,663.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.