Finding the Fourth Proportional to 390,755.21, 539,264.93 and 218,671.72
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Solution
The fourth proportional to 390,755.21, 539,264.93 and 218,671.72 is: 301,779.70
Step by Step Solution
- Step 1: Write the proportion equation
390,755.21 : 539,264.93 = 218,671.72 : x - Step 2: Convert to fraction form
390,755.21/539,264.93 = 218,671.72/x - Step 3: Cross multiply
390,755.21x = 539,264.93 × 218,671.72 - Step 4: Simplify right side
390,755.21x = 117,921,987,337.26 - Step 5: Solve for x
x = 117,921,987,337.26/390,755.21 - Step 6: Final answer
x = 301,779.70
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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.