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Finding the Fourth Proportional to 390,937.64, 539,494.98 and 212,089.64

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Solution

The fourth proportional to 390,937.64, 539,494.98 and 212,089.64 is: 292,684.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,937.64 : 539,494.98 = 212,089.64 : x
  2. Step 2: Convert to fraction form
    390,937.64/539,494.98 = 212,089.64/x
  3. Step 3: Cross multiply
    390,937.64x = 539,494.98 × 212,089.64
  4. Step 4: Simplify right side
    390,937.64x = 114,421,296,090.01
  5. Step 5: Solve for x
    x = 114,421,296,090.01/390,937.64
  6. Step 6: Final answer
    x = 292,684.27

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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.