Finding the Fourth Proportional to 390,878.60, 539,414.46 and 221,109.08
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Solution
The fourth proportional to 390,878.60, 539,414.46 and 221,109.08 is: 305,131.65
Step by Step Solution
- Step 1: Write the proportion equation
390,878.60 : 539,414.46 = 221,109.08 : x - Step 2: Convert to fraction form
390,878.60/539,414.46 = 221,109.08/x - Step 3: Cross multiply
390,878.60x = 539,414.46 × 221,109.08 - Step 4: Simplify right side
390,878.60x = 119,269,432,292.23 - Step 5: Solve for x
x = 119,269,432,292.23/390,878.60 - Step 6: Final answer
x = 305,131.65
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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.