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Finding the Fourth Proportional to 209,779.80, 314,669.70 and 121,206.30

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Solution

The fourth proportional to 209,779.80, 314,669.70 and 121,206.30 is: 181,809.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,779.80 : 314,669.70 = 121,206.30 : x
  2. Step 2: Convert to fraction form
    209,779.80/314,669.70 = 121,206.30/x
  3. Step 3: Cross multiply
    209,779.80x = 314,669.70 × 121,206.30
  4. Step 4: Simplify right side
    209,779.80x = 38,139,950,059.11
  5. Step 5: Solve for x
    x = 38,139,950,059.11/209,779.80
  6. Step 6: Final answer
    x = 181,809.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.