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Finding the Fourth Proportional to 620,429.55, 869,782.35 and 620,429.55

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Solution

The fourth proportional to 620,429.55, 869,782.35 and 620,429.55 is: 869,782.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,429.55 : 869,782.35 = 620,429.55 : x
  2. Step 2: Convert to fraction form
    620,429.55/869,782.35 = 620,429.55/x
  3. Step 3: Cross multiply
    620,429.55x = 869,782.35 × 620,429.55
  4. Step 4: Simplify right side
    620,429.55x = 539,638,672,008.44
  5. Step 5: Solve for x
    x = 539,638,672,008.44/620,429.55
  6. Step 6: Final answer
    x = 869,782.35

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.