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Finding the Fourth Proportional to 390,683.25, 539,146.13 and 211,835.25

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Solution

The fourth proportional to 390,683.25, 539,146.13 and 211,835.25 is: 292,334.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,683.25 : 539,146.13 = 211,835.25 : x
  2. Step 2: Convert to fraction form
    390,683.25/539,146.13 = 211,835.25/x
  3. Step 3: Cross multiply
    390,683.25x = 539,146.13 × 211,835.25
  4. Step 4: Simplify right side
    390,683.25x = 114,210,154,175.91
  5. Step 5: Solve for x
    x = 114,210,154,175.91/390,683.25
  6. Step 6: Final answer
    x = 292,334.40

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1.5x scale

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.