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Finding the Fourth Proportional to 390,726.04, 539,224.53 and 218,642.50

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Solution

The fourth proportional to 390,726.04, 539,224.53 and 218,642.50 is: 301,739.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,726.04 : 539,224.53 = 218,642.50 : x
  2. Step 2: Convert to fraction form
    390,726.04/539,224.53 = 218,642.50/x
  3. Step 3: Cross multiply
    390,726.04x = 539,224.53 × 218,642.50
  4. Step 4: Simplify right side
    390,726.04x = 117,897,395,511.19
  5. Step 5: Solve for x
    x = 117,897,395,511.19/390,726.04
  6. Step 6: Final answer
    x = 301,739.29

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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.