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Finding the Fourth Proportional to 621,408.61, 931,466.53 and 421,745.23

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Solution

The fourth proportional to 621,408.61, 931,466.53 and 421,745.23 is: 632,179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,408.61 : 931,466.53 = 421,745.23 : x
  2. Step 2: Convert to fraction form
    621,408.61/931,466.53 = 421,745.23/x
  3. Step 3: Cross multiply
    621,408.61x = 931,466.53 × 421,745.23
  4. Step 4: Simplify right side
    621,408.61x = 392,841,565,932.15
  5. Step 5: Solve for x
    x = 392,841,565,932.15/621,408.61
  6. Step 6: Final answer
    x = 632,179.15

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1.5x scale

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.