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Finding the Fourth Proportional to 390,678.52, 539,110.86 and 218,567.08

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Solution

The fourth proportional to 390,678.52, 539,110.86 and 218,567.08 is: 301,608.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,678.52 : 539,110.86 = 218,567.08 : x
  2. Step 2: Convert to fraction form
    390,678.52/539,110.86 = 218,567.08/x
  3. Step 3: Cross multiply
    390,678.52x = 539,110.86 × 218,567.08
  4. Step 4: Simplify right side
    390,678.52x = 117,831,886,466.49
  5. Step 5: Solve for x
    x = 117,831,886,466.49/390,678.52
  6. Step 6: Final answer
    x = 301,608.31

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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.