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Finding the Fourth Proportional to 529,688.90, 730,985.11 and 287,987.74

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Solution

The fourth proportional to 529,688.90, 730,985.11 and 287,987.74 is: 397,430.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    529,688.90 : 730,985.11 = 287,987.74 : x
  2. Step 2: Convert to fraction form
    529,688.90/730,985.11 = 287,987.74/x
  3. Step 3: Cross multiply
    529,688.90x = 730,985.11 × 287,987.74
  4. Step 4: Simplify right side
    529,688.90x = 210,514,747,255.12
  5. Step 5: Solve for x
    x = 210,514,747,255.12/529,688.90
  6. Step 6: Final answer
    x = 397,430.92

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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.