Home / 429,890.40-644,835.60-385,603.65

Finding the Fourth Proportional to 429,890.40, 644,835.60 and 385,603.65

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Solution

The fourth proportional to 429,890.40, 644,835.60 and 385,603.65 is: 578,405.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,890.40 : 644,835.60 = 385,603.65 : x
  2. Step 2: Convert to fraction form
    429,890.40/644,835.60 = 385,603.65/x
  3. Step 3: Cross multiply
    429,890.40x = 644,835.60 × 385,603.65
  4. Step 4: Simplify right side
    429,890.40x = 248,650,961,009.94
  5. Step 5: Solve for x
    x = 248,650,961,009.94/429,890.40
  6. Step 6: Final answer
    x = 578,405.48

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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.